Impressive for someone so young, we have a few young guys in our school that quite often act like goofs.
In my school we include pressure point applications with our self defense techniques, they can be effective against people with iron grips. It gives them something else to think about while you are applying the self defense technique.
Try applying pressure to the spot between the index and middle finger, hurts like hell if you do it right. Or the web between the thumb and index finger. There are lots spots.